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CISC emphasis on hardware but RISC emphasis on software,CISC Includes multi-clock
complex instructions but RISC includes Single-clock,reduced instruction only.CISC includes Memory-to-memory:"LOAD" and "STORE" incorporated instructions but RISC includes Register to register:"LOAD" and "STORE" independent instructions.CISC have Small code sizes,high cycles per second but RISC have Low cycles per second,large code sizes.In CISC Transistors used for storing complex instructions but in RISC Spends more transistors on memory register

Complex Instruction Set Architecture (CISC) : The CISC approach attempts to minimize the number of instructions per program, sacrificing the number of cycles per instruction.
Reduced Instruction Set Architecture (RISC): RISC does the opposite, reducing the cycles per instruction at the cost of the number of instructions per program.

In Modern computer, RISC architecture is preferable since memory is not much expensive. In RISC architecture your program size is more and fast processing.